International audienceFrom the last years of Antoninus Pious'reign to the end of Commodus the cities of the Roman Empire had to face up to food shortages, plague and wars. These crisis are here approached in terms of risk exposure. Cities had various perceptions and responses to these risks. These responses were political and economical but also religious ones, especially with plague. The ability to appeal to an higher authority as the Emperor, his administrators, or an oracle was an important way to cope with danger.Des dernières années du règne d'Antonin le Pieux à la fin de celui de Commode, les cités de l'Empire romain durent faire face aux disettes, à la pestilence et aux guerres. Ces crises sont ici considérées en terme d'exposition a...